Whistle



FIG. 1 is a reduced perspective view of a whistle showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front elevational view thereof.

The ornamental design for a whistle, as shown.